Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010georl..3718305m&link_type=abstract
Geophysical Research Letters, Volume 37, Issue 18, CiteID L18305
Physics
4
Seismology: Lithosphere (1236), Seismology: Body Waves, Tectonophysics: Continental Cratons, Tectonophysics: Continental Tectonics: General (0905)
Scientific paper
Delineating mantle interfaces can provide important clues for understanding the formation of continents. We use S-wave receiver functions to investigate lithospheric structure along a transect extending from Vancouver Island to Baffin Island. Observed Sp converted waves allow for interpretation of boundaries in the depth range expected for tectonic plates. Receiver functions show a distinct negative amplitude feature, interpreted as the lithosphere-asthenosphere boundary, at shallow depths beneath British Columbia (˜85km), deepening abruptly at the eastern edge of the Cordillera to ˜260km beneath the Canadian Shield. Dipping mid-lithospheric discontinuities extend beneath several giant ca. 1.8 Ga epicontinental magmatic arcs, consistent with formation of cratonic lithosphere by arc accretion. This model provides a plausible explanation for global mid-lithospheric discontinuities within cratons and aids in understanding their formation.
Eaton David W.
Miller Meghan S.
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